| Factor | Dimensionless parameter | Symbol | Description |
| Response effects | Stokes No. | St | St < 60 turbulent attenuation, 60 < St both attenuation and augmentation |
| Inertial effects | Particle Reynolds No. | Rep | Rep < 200 only attenuation, 400 < Rep only augmentation (spherical particles) Rep < 200 only attenuation, 650 < Rep augmentation (non-spherical particles) |
| Surface effect | length scale ration | dp/le | dp/le < 0.1 only attenuation, 0.25 < dp/le only augmentation |
| Loading effect | Mass loading, article volume fraction | Φm, Φv | Φv < 10−6 one way coupling 10−6 < Φv < 10−3 two way coupling 10−3 < Φv four way coupling |